I am currently trying to design a circuit on a Mac (some might say therein lies my problem). My goal is simply to design a rudimentary implementation of the circuit which I can visualise working I have tried:

  1. Tinkercad circuits
  2. the Falstad JavaScript (or desktop version) circuit simulator
  3. downloading LTSpice for Mac.

The problem with 1) and 2) are that as soon as I start working with larger arrangements they start to bog down and stutter, both become unusable. In terms of using LTSpice I am keen but I cannot find any suitable models for components such as a shift registers, 7 segment displays etc.

One point of intrigue with respect to this problem has been the NXP SimKit but I cannot even start to decipher whether it would work with LTSpice for Mac, can anyone help?

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    \$\begingroup\$ You're doing only digital simulation, or do you want to do analog/mixed mode too? Logisim is very popular, but a bit old and no longer being updated, and Digital has been designed as a replacement for it; both are implemented in Java so should run fine on a Mac. Both only do digital simulations, though. \$\endgroup\$ – Jules Jul 11 '18 at 23:18
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    \$\begingroup\$ Regarding LTspice's rather eclectic selection of libraries: remember that it's supplied by Linear Technologies with the express intention to help you design power supplies using their SMPS ICs -- any other application it may have is not officially supported. This explains a lot about what it does and doesn't include... \$\endgroup\$ – Jules Jul 11 '18 at 23:26
  • \$\begingroup\$ @Jules I don't want to speak too soon as I have been searching (and attempting to make many different things work) for a fair while but that looks very promising! Looking at the screenshots it seems as if there is comprehensive componentry to choose from, given that the models are built-in \$\endgroup\$ – Scott Anderson Jul 11 '18 at 23:42
  • \$\begingroup\$ There is a library for CDxxxx ICs, search for it on the Yahoo LTspice Group, or on ltwiki.org. Otherwise, you can build those out of the basic elements found in the [Digital] folder (in the "place element" dialog). But, really, if you're after digital, then @Jules 's suggestion is better. \$\endgroup\$ – a concerned citizen Jul 12 '18 at 6:01

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